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The BMW Range
3 Series
E30
spark cable or coil
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<blockquote data-quote="fabianyee" data-source="post: 456123" data-attributes="member: 6"><p>Engine not smooth can be due to, coil, s/plug cables or even the Air Flow Meter... </p><p></p><p>s/plug cable can be checked easily, just remove one at a time and see if there's any different when 1 cable is unplug... If the cable is fine, then unplugging it will instantly cause the engine to idle badly... if the cable is bad, unplugging it will cause significant vibration.... </p><p></p><p>Also check if the cable insulation is good or aledi hardened and cracked... bad insulation will cause power leakage, but you'll hear/see spark escaping from the crack insulation or get zapped if your hand gets near it... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue :p" loading="lazy" data-shortname=":p" /> </p><p></p><p>Try cleaning the AFM, maybe the 'barndoor' flap is not opening or closing smoothly..</p></blockquote><p></p>
[QUOTE="fabianyee, post: 456123, member: 6"] Engine not smooth can be due to, coil, s/plug cables or even the Air Flow Meter... s/plug cable can be checked easily, just remove one at a time and see if there's any different when 1 cable is unplug... If the cable is fine, then unplugging it will instantly cause the engine to idle badly... if the cable is bad, unplugging it will cause significant vibration.... Also check if the cable insulation is good or aledi hardened and cracked... bad insulation will cause power leakage, but you'll hear/see spark escaping from the crack insulation or get zapped if your hand gets near it... :p Try cleaning the AFM, maybe the 'barndoor' flap is not opening or closing smoothly.. [/QUOTE]
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